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How do you do a practical with a trolley on a ramp?

1. Mass of equipment, length of card, set up
2.adjust change height until the trolley just starts to move
3. Mark a line this makes it a fair test. And a equal experiment
4.put the string on the mass then let go
5. Light gate will record the time. Use the equation
Initial speeds
Final speed
Time it takes


What are some sources of human error?

Different reaction times
To fix this you need to use a stopwatch and a rolling tape